Teleprinting device



Nov. 24, 1953 K. HAJEK TELEPRINTING DEVICE 2 Sheets-Sheet 1 Filed July25, 1950 INVENTOR.

K. HAJEK TELEPRINTING DEVICE Nov. 24, 1953 2 Sheets-Sheet 2 Filed July25, 1950 INVENTOR Jill/Lag Hug 6% Patented Nov. 24, 1953 VTELEPRINTINGDEVICE Karel Hajck, Prague, Czechoslovakia,

assignor of one-half to Tesla,'national corporation, Prague,

Czechoslovakia, .vakia a corporation of Czechoslo- Application July 25,1950, Serial N0. 175,781

Claims priority, application Czechoslovakia August 17, 1949 "7 claims.(01. 178-47) My invention relates to a teleprinting device whichtransforms the characters of the transmitted intelligence into a codecomprising combinations of consecutive positive, negative or combinedimpulses.

An object of the invention is to provide an improved teleprinting deviceof the type mentioned above. In accordance with the inventioncombination bars used in my .device are not shifted longitudinallyrelative to the keylevers as is the case in prior art devices, but theyare turned or tilted by a small angle about an axis parallel with theirlongitudinal axis. This turning or tilting movement is controlled byteeth provided on the keylevers, such teeth on each keylever beingarranged in accordance with the code corresponding to the individualcharacters whichare to be transmitted.

This and other objects, advantages and novel features of my inventionwill be apparent from the following description when read together withthe accompanying drawings in which:

Fig. 1. shows a perspective view of my new teleprinting device,

Fig. 2 shows a sectional view along line 2-2 of Fig. l, V

Fig. 3 shows schematically a plan View of the contact mechanism of mynew device,

Fig. 4 shows a plan view of an enlarged detail of the cantact mechanismof Fig. 3, and

Fig. 5 shows a side view of the locking device employed in theinvention.

The embodiment of my new teleprinting device as illustrated in thedrawing is by way of example adapted to transmit a five number code. Itcomprises a, customary keyboard composed of a plurality of keylevers Iwhich are swingable in a vertical plane. However, only one keylever I0having a key marked Z is shown. Each keylever I0 is provided on its baseedge with a particular combination of toothlike projections Ill and saidcombination upon different keylevers differ from each other to make eachcorrespond to a code indicative of the character served by therespective keylever.

The keylevers I0 cooperate with a plurality of combination bars whichextend perpendicularly to and below of the set of keylevers I0. In theshown embodiment adapted to transmit a five number code five suchcombination bars II, I2, I3, I4, I are used. However, it will be wellunderstood that the number of said combination bars may be decreased orwill have to be increased, respectively, if a code of less or of morenumbers is to be transmitted.

2 Each combination bar II or turnable about its lower parallel theretoand is supported in a cradle or similar structure permitting saidtilting or turning movement. In the shown embodiment each combinationbar rests in an essentially V-shaped incision arranged in supports 6.movement of the bars is effected toothlike projections by the said It onthe keylevers I!) as soon as one or the other keylever is presseddownand the shown'position of the bars I3, I4 the working position. 7Each of the combination bars II through I5 actuates by means of a noseor similar member I6 and an intermediate pressure ball a stationarysupport I! caged in parent from Figs. 1 and 3.

When certain combination bars such as the bars II, I3, I5 are in theneutral position defined above, then the respective contacts PH, 22, 23will" acted upon and will remain open. When, however, any of thecombination bars is turned not be or tilted by the action of theprojection Ill of any keylever III into the working position definedabove then the nose Is upon said bar, such as the bars I 2, I4, willpress upon the respective ball I? and close the contacts 22, ing fromthe enlarged showing in from Figs. 1 and 3, each nose I6 two slantingfaces namely with a face It which actuate the respective pressure ballI! and effects the closing of the respective electric contact, and witha locking face I3 which in cooperation with the respective resilientelectric contact holds the respective combination bar such as I 2, It intheir working positions. The neutral po sition of the nose I6 is shownFig. 4.

Fig. 5 illustrates the locking mechanism which temporarily holds thecombination bars I I through V I5 in any position into which they havebeen adjusted by one of the actuated keylevers IIl. Said lockingmechanism comprises a locking lever 27' EM Q F through I5 is tiltable.edge or about an axis.

The tilting the set of combination barswill' combinations as illustratedin Fig.-

I'I' one of a set of resilient electric coding contacts 2I through 25 asap- 24. As appear- Fig. 4, but also is provided with in dotted lines inI locking lever is normally in a neutral'position I in which it does notcooperate with the combination bars. In such neutral position theprojection 28 arranged upon the upper'edge of the locking lever 21engages the said recess 29 of the cam 26. However, as soon as one of thekeylevers I is pressed downward against the combination bars and thedriving motor mentioned above is set into operation rotating the cam 26,the projection 28 will be forced out of said recess 29 and will slideupon the circular surface of' said cam thus pressing the locking lever21 with its locking teeth against the combination bars so that they areheld on their adjusted position until the projection 28reenters therecess 29; The rotational speed and the circumferential shape of the cam26 are so chosen that the locking lever 21 remains in its lockingposition-shown in Fig. 5 during the time required for transmission ofall code impulses.

While one specific embodiment of my invention has been shown anddescribed in detail to illustrate the application of the principles ofmy invention, it will be well understood that the same may be otherwiseembodied without departing from such principles.

What I claim as my invention is:

1. In a teleprinting device the combination comprising a keyboardserving to transmit distinct characters; a plurality of keyleversmounted in parallel, each keylever associated with one key of saidboard, a plurality of combination bars arranged perpendicularly to saidkeylevers, a support for said combination bars, said sup port having aplurality of essentially V-'shaped incisions, each incision adapted toreceive one of said combination bars and to permit the same to tilttherein about its longitudinal base edge from a neutral position into aworking position, a combination of toothlike projections on eachkeylever, each of said combination corresponding'to a code indicative ofthe character served by the respective keylever, said projectionsadapted to tilt selected combination bars within the respective incisionfrom their neutral position into their working position, a plurality ofelectric contact devices each indicative of the working position of oneof said combination bars, and means associated with each combination barto actuate the respective electric contact device.

2. In a teleprinting device the combination comprising a keyboardserving to transmit distinct characters, a p-luralityof keyleversmounted in parallel, each keylever associated with one key of saidboard, a plurality of combination bars arranged perpendicularly to saidkeylevers, cradles freely supporting said combination bars for a tiltingmovement therein about their longitudinal base edge from a neutralposition into a working position, a combination of toothlike projectionson each keylever, each of said combinations corresponding to a codeindicative of the character served by the respective keylever,

said projections arranged to effect the said tilting movement ofselected combination bars, a plurality of electric contact devices eachindicative of the working position of one of said combination bars, andmeans associated with each combination bar to actuate'the respectiveelectric contact device.

3. In a teleprinting device the combination comprising a keyboardserving to transmit distinct characters, a plurality of keyleversmounted in parallel, each keylever associated with one key of saidboard, a plurality of combination bars arranged perpendicularly to saidkeylevers, cradles freely supporting said combination bars for a tiltingmovement therein about their longitudinal base edge from a neutralposition into a working position, a combination of toothlike projectionson each keylever, each of said combinations corresponding to a codeindicative of the character served by the respective keylever, saidprojections arranged to effect the said titlting movement of selectedcombination bars, a plurality of electric spring contacts eachindicative of the workin position of one of said combination bars, anose at one'end of each combination bar adapted to actuate therespective electric spring contact by closing the same while thecombination bar tilts from its neutral position into its working posi-'tion.

4. In a teleprinting device the combination comprising a keyboardservingto transmit distinct characters, a plurality of keylevers mountedin'parallel, each keylever associated with one key of said board, aplurality of combination bars arranged perpendicularly to saidkeylevers, cradles freely supporting said combination bars for a tiltingmovement therein about their longitudinal base edge from a neutralposition into a working position, a combination of toothlike projectionson eachkeylever, each of said combinations corresponding to a codeindicative of the character served by the respective keylever, saidprojections arrangedto effect the said tilting-movement of selectedcombination bars, a plurality of electric spring contacts eachindicative of the working position of one of said combination bars, anoseat onelend of each combination bar to actuate the respectiveelectric contact while the combinationrbar tilts from its neutralposition into its working position and a freely rotatable caged ballbetween the latter and the respective nose.

5. In a teleprinting device the combination comprising a keyboardserving to transmit dis tinct characters, a plurality of keyleversmounted in parallel, each keylever associated with one key of saidboard, a plurality of combination bars arranged perpendicularly to saidkeylevers, cradles freely supporting said combination bars for a tiltingmovement therein about their longitudinal base edge from a neutralposition into a working position, a combination of toothlike projectionson each keylever, each of said combinations corresponding to a codeindicative'of the character served by the respective keylever, saidprojections arranged to effect the said tilting movement of selectedcombination bars, a plurality of electric contact devices eachindicative of the working position of one of said combination bars,means associated with each combination bar to actuate the respectiveelectric contact device, a locking device to hold the combination barsin their adjusted neutral and working positions, respectively, and meansactuating said lockmg device to operate simultaneously with thedepression of a key of said key board;

was

6. In a teleprinting device the combination ing movement therein abouttheir longitudinal comprising a keyboard serving to transmit disbaseedge from a neutral position into a working tinct characters, a luralityof keylevers mounted position, a combination of toothlike projections onin parallel, each keylever associated with one key each keylever, eachof said combinations correof said board, a plurality of combination barssponding to a code indicative of the character arranged perpendicularlyto said keylevers, served by the respective keylever, said projectionscradles freely supporting said combination bars arranged to eifect thesaid tilting movement of for a tilting movement therein about theirlonselected combination bars, a plurality of electric gitudinal baseedge from a neutral position into contact devices each indicative of theworking a working position, a combination of toothlike position of oneof said combination bars, means projections on each keylever, each ofsaid combiassociated with each combination bar to actuate nationscorresponding to a code indicative of the the respective electriccontact device, a toothed character served by the respective keylever,said locking lever to hold the combination bars in projections arrangedto efiect the said titling their adjusted neutral and working positions,removement of selected combination bars, a pluspectively, said lockinglever being mounted in rality of electric contact devices eachindicative of parallel to said keylevers, and means for dethe workingposition of one of said combination pressing said locking lever to bearwith its teeth bars, means associated with each combination bar againstthe combination bars, said means operatto actuate the respectiveelectric contact device, a in Simultaneously with the dep n of a ytoothed locking lever to hold the combination of said keyboard.

bars in their adjusted neutral and working posi- KAREL HAJEK. tions,respectively, and means for depressing said locking lever to bear withits teeth against the References Cited in the file of this patentcombination bars, said means operating simul- UNITED STATES PATENTSltiarsizggilg with the depression of a key of said Number Name Date2,121,873 Hebel et al June 28, 1938 7. In a teleprinting device thecombination comprising a keyboard serving to transmit distinctcharacters, a plurality of keylevers mounted 2,126,846 Watanabe Aug. 16,1938 2,262,321 Gundlfinger et a1. Nov. 11, 1941 in parallel, eachkeylever associated with one key FOREIGN PATENTS of said board, aplurality of combination bars ar- Number Country Date rangedperpendicularly to said keylevers, cradles 3 5, 32 France 5 1937 freelysupporting said combination bars for a tilt-

